Power-barring apparatus



E. SCHNEIDER.' POWER B ARRING APPARATUS.

I APPLICATION FILED MAR. 3|, 1919. 1,353,275, f Pantedsept. 21,1920.

E. SCHNEIDER@ POWER EARRING APPARATUS.

APPLlcATloN FILED MMLSI. |919.

1 353,275. lmutedsept.21,1920;

3 SHEETS-SHEET 2.

E; SCHNEIDER( Powsn BARRINGQAPPARATUS. APPLICATION FILED MR. 3l. 1919.

Patented sept. 21,1920.y

3 SHEETS-SHEET 3.

UNITED STATES EUGENE SCHNEIDER, or PAEIsrEANsE, AssIcNiaro sci-INEIDEE c; cIE., 'or raars,

FRANCE, A LIMITED IoINLr-srocKcoiVIrANYroE EB,.1.il\ ICE.

Application 'filed i'frchl, 1919. seal Nojaaaoo. Y

' the following specification.

y vice for indicating the position of the toothed l cylinder A by the operation of: a three-Way rfhis invention hasifor its object to provide an improved power barrin apparatus, that is to say, an apparatus fo slowly through fractions of a revolution, a shaft or line of shalting, for instance the shaft of a steam turbine, While the admission of motive fluid is sllut off, for the purpose of inspection or repair.

The improved barring apparatus belongs to that class of such apparatus comprising a piston driven by pressure fluid for actuation of one of the elements of a spring ratchet gear, the other element being carried by the shaft which it isrdesiredto rotate; the said ratchet gear being automatically rendered inoperative by an opposing spring immediately the pressure fluidV ceases to'act upon the said piston.

The essential characteristic feature of thev improved apparatus consists in this'th'at the ratchet element' actuated by the' piston, is

formed on'the free end of a SleeVesur- 30 rounding the said piston and movable with the latter in the cylinder in Which* the pres'-y sure fluid acts. The loll':gitl'id inalv motiol'l of the piston is converted into an advancing and rotational movement lof the sleeve-by means of tenons 'fixed on the lpiston and guided in rectilinear slots in the cylinder, being engaged at the same time in helical slots formed in thesl'eeve.`

In one constructional proved apparatus the ratchet element car-,

ried byl the sleeve is constituted by teeth formed on the end or face of the said sleeve;

the cooperating element ofthe ratchet gear being constituted by corresponding teeth formed on the end of the shaft to be rotated.

The invention comprises alsoa simple dc.-

sleeve. ,Y InV the accompanying V drawings which illustrate by Way of example'l a construe? r rotating ers d2 are en ao'ed in dia'met'ricalll o o'site formiy ofl the `im'- Y A Specification*of Letters Fig. -2 is a horizontal section onthe line H;II of Fig. l. y

Fig. HI- 'IH of Fig. 1. Fig..4 is an end view taken from the linexIV; IV of'Fig. 1;; i

Fig. '5 is a vertical longitudinal section AIfENT OFFICE `v 3 is a cross section on they lineV similar to Fig.'1,'but sh'ovvingl the `parts vina position 'of engagement.V fi VIF ig. 6 is a'n-end view taken fromthe line Vl-VI of Fig. l; and 1 Fig 7 isY a vertical section on a larger scale of agmodiied form fluid distributer. y "The improved apparatus comprises a' cylinder Aserving as' a support or casing `for the device, and fixed bymeansof bolts 6to the fixed 'part B ofthe apparatus. This of the pressure cylinder is open atv one endand closed at the other'by a suitable head. f' Y In the cylin ler A is mounted-a sleeve C carrying one' of the elements of 'the ratchet` gear-and surrounding the'factuating piston- D-Whih receives ffrom 'an opposingspring E a constant tendency toren-'lain inthe inoperative position it is kshown occupying 1n Figs' 1` and 2# The 'pistoni-s hollow, beine' .closed at one end'and open-at the other opposite to thehead of the cylinder. The piston D is provided with t'iv'o tenons or ins cl. each furnished with two rollers nuts d3. The rollers d1 are engagedins'lots teeth' clformed onl the' end or faceof the n sleeve@ anddesigned to come'int'o engageLV Vment-With `teeth j that `constitute the com# pleme'ntary elementof the saidgear. I. These teeth'flmay be rotated:

.The pressure vfluid is yadmitted into-fthe cock One branch, hi, off the-casingof this l cock jcommunicates with the interior Vof the cylinder A through the .headthereof, v`

formed fon'a dislror collar" i F mounted on the'endof the shaftG to be i i l 100 K a second branch lis connectedfto'f the vsupply of the fluid, and the third branch h3 is connected to an exhaust pipe I;

'is not limited.

On moving the plug of the cock H into the position shown in Fig. 5, wherein Vcommunication is established through the ports Quand l between the pipes Zal andi h2, the pressure fluid is admitted into the cylinder' A. By this means the sleeve C rand the pis- E. The teeth 0 1 of the sleeve C come in contactrwith the teeth. f of the collar F on the shaft G.

The advance of the piston D causesV the rollers d1 and d2 to roll respectively along the sides of the slots a and c, and.4 owing to the helical form of the slots c the sleeve C will be caused to rotate on its own axis, and this rotational motion will be transmitted by the teeth c1 and fto the shaft Ggto be rotated. Y.

rlhe proportion `between the stroke of the piston D and the rotational movement of the movable sleeve C, dependsy yon the effortto be exerted upon the teeth c1 and f, and the available pressure of the motive fluid. The improved apparatus must be so designedas to insure that the complete single stroke of the piston D shall rotate-the collar F throughan angle corresponding tothe pitch of the teethc1 and f, so that in order to rotate the said collar through a complete revolution, the piston will have to make as many complete-double (to-andro) strokes as there are teeth, on the collar F. A

YWhen the sleeve C is pushed by the pressure fluid it may happen that the teeth c1 and f. do not engage together immediately; they will however becomev completely engaged within a. portion of the rotation of the When the piston D arrives at the end of its forward stroke (Fig. 5), an orificegd* (F ig. 2)' formed in its'side comes opposite the lslots a and c, and the pressure fluid this avoids any risk of over-pressure in cases wherethe pressure of thel motivefluid In'order to cause the apparatus to return into-its inoperative or starting position shown in F igs. 1 and 2, it is suliicicnt to turnY the three-way` cock H through Vone-quarter of a revolution-to the right so as to shut off-V the admission of the pressure (fluid, and establish communication between the passages tl andhs by" means of theports 3 and lof the plugz(Fig. l). The piston D is moved back by the spring E, and =by thismeans thesleev'e'is rotated in the reverse directionto its previous' rotation, withY the result that the 'teeth c1y and f are forcedto un-v mesh by slipping over their inclined fai Before the endjof its return strokethe pis` `pins dthrough their rollers d2 bearing on ton D moves the movable sleeve''back with it so as to disengage the teeth c1 completely from the teeth f. VThecasing A, the hollow piston D andthe interposedA sleeve C 'form a telescopic chamber of comparatively large volumetric capacity, considering the restricted size of the port h1 supplying fluid -pressure to said chamber. Furthermore, the capacity of the chamber. progressively increases 'as the hollow piston moves away from the cylinder head. Consequently, there must be considerable expansion of thefluid-pressure entering the chamber before and during the movement of the piston and with a resulting slow 80 movement of the same Vtogether with the sleeve. As the pistonadvances it'carries with it the sleeve, owing to'thel frictional contact of the engagdsides of said members,\and also to the camming action of the the curved sides of helical slots c in the sleeve. Furthermore, when the inner end of the sleeve separates fromA the cylinder head the fluid-pressure becomes effective, to some extent, on such end to advance the sleeve.

With the resulting slow advance of the piston the sleeve is slowly rotated through the camming action of the pins d and their rollers Z2 in the helical slots c ol' thesleeve, 95 the piston being guided to travel rectilinearly by the engagement of the rollers-d1 of the pinsxl in the longitudinal slots aol. the casing. The advance of the sleeve engages the ratchet members c1 Vand f, andthe 100 slow rotation of the sleeve-is imparted to the 1; shaft G through a fraction of arevolution. As there is but a single advance of the piston and sleeve for-each admission of fluidpressure to the telescopicchamber, andas the-iluid-pressure supply pipe is manually 1 controlled, not only can therebe secured l a slow turning of the shaft for apartial revolution,l but the intervals kbetweenthe fturnings can be regulated to meet vthe requirements of inspection and repair.

operated by means of a handlever L. ,A spring M has a constant tendency to keep the valve iny position' of exhaust as shown in Fig. '.1'. s t f 'To admit `the pressure fluid into theibarring apparatus,A 1t is merely necessary to press the handlever L down into 'the posi-t 130 tion indicated the'idot-'and-dash li-ne',

so as-to lift the valve, and-thus establish communication between f branches jland j?. i -1 v "To'exha'ust the pressure fluid v from the barring apparatus', it is sufficient to'releaseY the handlever L, whereupon 'the spring 'Ml t'landfkz' are in equilibrium at alll times.'v

The necessity of keeping the handlever L by hand in the position'for admitting the y motive fluid in the' apparatus willV prevent any untimelv admission of the said fluid. l

A- smallv orificel formed in the end of the piston D .would assure more slowly the exhaust of the Vmotive fluid vfromithe apparatus incase the'y cock or the valve should become' choked accidentally..

4N yis a pointer receiving lits movementl from the sl'eevevCV by means of two'cogs 02 havingv inclined faces, formed on theI said sleeve, and arranged lto -drive by contact a lever O which produces a rotational movement in the cylinder, of a shaft P that carries the said pointer.

The pointer N thus indicates exactly the various positions of the sleeve C. Q is a scale from which the said positions can be read, amplified in the proportion of the length of the pointer N to the length of the lever O.

Although situated preferably at one end of the shaft to be rotated, the improved barring apparatus may be mounted aty any other point and be adapted to operate through connecting gear, and it may be employed in all cases where rotary parts require to be barred.

TWhat I claim is l. in barring apparatus, a shaft having a ratchet member fixed thereon, a cylindrica casing having a restricted port at one end to admit fluid-pressure to the interior of the same, a piston reciprocative in the casing and constituting with the same a telescopic chamber of large capacity, as compared with the admission port, for the expansion of thev fluid-pressure therein to effect a slow advance of the piston, a sleeve reciprocative between the casing and the piston and having a ratchet member complementary to and normally separated from the ratchet member fixed on the shaft, and a tenon on the piston having sliding engagements with a helical slot in the sleeve and a longitudinal slot in the cylindrical casing so that the advance of the piston will impart a slowly rotative advance tothe sleeve to engage the complementary ratchet members to turn slowly the shaft through a partial revolution. y

2. In barring apparatus, a shaft havin a ratchet member fixed thereon, a cylindrica casing open at one `end and'closed at the; f

other-'by .a head having a' restricted `porty .tol admitfluid-pressure to the interior ofthef casing,Y a hollow piston reciprocative inV fthe' casing closed "at Ione lend and .open at. :the:

otherlopposite to -theifhead' of thezlcylinden'w pared-'with the admission port, for the expansionthereinof the fluid-pressure to eectl aslow' advance of the4 piston, a' sleeve reciprocative between the casing andthe piston and vhaving a ratchet" member complementary to and normally-separated from the.

ratchet member fixed on thefshaft, andy a tenon on the piston' having slidingengagements with a yhelical slot in the :sleeve and a longitudinal slot in the ycylindrical casing so'that theadvance at the' Piston' will im' part a slowly rotative advance tothe sleeve to. engage-the complementary ratchet mem-y bers tol turn slowly the fshaftzthrough av partial revolution. i 1

3; Inn barring apparatus," a shaft having ai ratchetmemberfxed thereon, a cylindricali casingopen at one end and closed at the other by a head having a restricted port to admit fluid-pressure to the interior of the casing, a sleeve reoiprocative in the-casing having a ratchet member complementary to and normally separated from the ratchet member xed on the shaft, a hollow piston reciprocative in the sleeve closed at one end and open at theother opposite to the head of the cylinder, said casing, sleeve and hollow piston constituting a telescopicV chamber of large capacity, as compared with the admission port, for the expansion therein of said' piston- ,,constituting-with thec'asing 'aff telescopic chamber *ofl large capacity, as geomthe fluid-pressure to effect a slow advance .f

of the piston, and a tenon on the piston having sliding engagements with a helical kslot in the sleeve and a longitudinal slot in the cylindrical casing so that the advance of the piston will impart a slowly rotative advance to the sleeve to engage the complementary ratchet members to turn slowly the shaft through a partial'revolution. c

4. In barring apparatus, a shaft having a ratchet member fixed thereon, a cylindrical casing open at one end and closed at the other by a head having a restricted port lio to admitv fluid-pressure to the interiorof the casing, a sleeve reciprocative in the casingv having a ratchet member complementary to and normally separated from the ratchet member fixed on the shaft, a hollow piston l reciprocative in the sleeve closed at one end and open at the other opposite to the head of the cylinder, a spring in the hollow piston y connecting the latter with the cylinder head to press normally the piston against said head,'said casing, sleeve and hollow pistonV constituting a telescopic chamber of large Y capacity, as compared with the admission port, for the expansion therein of the fluidpressure Ato effect ya slow advanceV of the pistn against-the action'of'the spring, and a.

tenon on the piston havingl sliding engagementswith a helical slot in the sleeve and a: longitudinal slot `in the Lcylindrical casing so that Vthe advance lof the piston will im'-r partav slowly rotative advance to the sleeve toengage the .complementary ratchet mem- Y bers to .turn slowly the shaft through'a partial revolution, the return movement of the piston through the action of the spring on release of the fluid-pressure operating to retract the sleeve to its initial position and to v separate the ratchet members.

5. In barring apparatus, al shaft having a ratchet member xed thereon, a cylindriT cal casing open at one end and'closed at the other by ahead having a restricted port to admit fluid-pressure to the interior of thecasing, a sleeve reeiprocative in the casing having a ratchet membercomplementary to and normally' separated from the ratchet member fixed on the shaft, a hollow piston reciprocative -in the sleeve Vclosed at one end and open attheother opposite to the' head of the cylinder, said casing, sleeve and hollow piston constituting a telescopic chamber of large capacity, as compared with the admission'port, for the expansion therein of the fluid-pressure to effect a slow advance of the piston, anda tenon on the piston `having sliding enga ements with' a helical slot in the sleeve an a-longitudinal slot in the cylindrical casing so that the advance of the piston will impart a slowly rotative advance to the sleeve to engage the `complementary ratchet members to turnslowly the shaft through a partial rotation, said piston having a safety port in its head to permit the escape of excessive Huid-pressure from the telescopic chamber and said piston having a port inits' side to register with.the v EUGENE SCHNEIDER. 

